[eclipselink-dev] Fix for Bug#219995: SDO - XSD/TypeHelperDelegate defin

[David McCann <david.mccann@xxxxxxxxxx>]

All,

Please review the fix for the following bug and provide any feedback you may have:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=219995

Bug summary:

Since helpers are shared on a class loader basis it is possible for two threads attempt to define the same type at the same time. A number of different errors could occur, such as null pointers, multiple writable mappings, etc. To avoid this, the define methods on SDOTypeHelperDelegate and SDOXSDHelperDelegate should be synchronized.

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David McCann | Principal Software Engineer | TopLink Product
Oracle Corporation Canada
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